st number decreased by a second number is-30 . The first number increased by twice the second number is 4 .

해법

s t n u mb er d ecre a se d b y a seco n d n u mb er i s - 30 . T h e f i rs t n u mb er in cre a se d b y tw i ce t h e seco n d n u mb er i s 4 .

The numbers : - 18 \frac{2}{3}, 11 \frac{1}{3}

솔루션 단계

Represent the numbers with

x and y

number 1 : x

number 2 : y

A.T.Q.:

x - y = - 30

x + 2 y = 4

x - y = - 30, x + 2 y = 4 : x = - \frac{56}{3}, y = \frac{34}{3}

부적절한 분수를 혼합 숫자로 변환:

\frac{56}{3} = 18 \frac{2}{3}

부적절한 분수를 혼합 숫자로 변환:

\frac{34}{3} = 11 \frac{1}{3}

The numbers : - 18 \frac{2}{3}, 11 \frac{1}{3}